Decision time for the RFS?

There has been much discussion over the last year about problems in implementing the Renewable Fuels Standards (RFS) due to the expanding gap between the implied mandate for renewable biofuels (ethanol) and the E10 blend wall. Our previous posts on this issue can be found here, here, and here. In this post we update our previous analysis of EPA options for implementing the RFS for 2014 and 2015. The main focus is to highlight the constraints faced by the EPA as it considers potentially momentous decisions about the RFS rules for 2014 and 2015.